package com.qhong.util;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

/**
 * Created by qhong on 2018/6/5 11:26
 **/
public class ServletUtils
{
	/**
	 * 获取RequestAttributes
	 * @return
	 */
	public static ServletRequestAttributes getRequestAttributes()
	{
		RequestAttributes attributes = RequestContextHolder.getRequestAttributes();
		return (ServletRequestAttributes) attributes;
	}

	/**
	 * 获取request
	 */
	public static HttpServletRequest getRequest()
	{
		return getRequestAttributes().getRequest();
	}

	/**
	 * 获取response
	 */
	public static HttpServletResponse getResponse()
	{
		return getRequestAttributes().getResponse();
	}

	/**
	 * 获取session
	 */
	public static HttpSession getSession()
	{
		return getRequest().getSession();
	}

	/**
	 * 获取getStrAttribute
	 */
	public static String getStrAttribute(String name)
	{
		return StringUtils.valueAsStr(getRequestAttributes().getRequest().getAttribute(name));
	}

	/**
	 * 获取getIntAttribute
	 */
	public static int getIntAttribute(String name)
	{
		return StringUtils.valueAsInt(getRequestAttributes().getRequest().getAttribute(name));
	}

	/**
	 * 获取getStrParameter
	 */
	public static String getStrParameter(String name)
	{
		return StringUtils.valueAsStr(getRequestAttributes().getRequest().getParameter(name));
	}

	/**
	 * 获取getIntParameter
	 */
	public static Integer getIntParameter(String name)
	{
		return StringUtils.valueAsInt(getRequestAttributes().getRequest().getParameter(name));
	}

	/**
	 * 是否是Ajax异步请求
	 */
	public static boolean isAjaxRequest(HttpServletRequest request)
	{

		String accept = request.getHeader("accept");
		if (accept != null && accept.indexOf("application/json") != -1)
		{
			return true;
		}

		String xRequestedWith = request.getHeader("X-Requested-With");
		if (xRequestedWith != null && xRequestedWith.indexOf("XMLHttpRequest") != -1)
		{
			return true;
		}

		String uri = request.getRequestURI();
		if (StringUtils.inStringIgnoreCase(uri, ".json", ".xml"))
		{
			return true;
		}

		String ajax = request.getParameter("__ajax");
		if (StringUtils.inStringIgnoreCase(ajax, "json", "xml"))
		{
			return true;
		}

		return false;
	}
}
